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[" The number of all the possible triplets "(a_(1),a_(2),a_(3))" such that "a_(1)+a_(2)cos(2x)+a_(3)sin^(2)(x)=0" for all "],[" is: "],[[" [A] 0"," [B] "1," [IIT-JEE,1987] "],[" [A] 3"," [D] Infinite "]]

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